Typewriting machine



G. A. SEIB.

TYPEWRITING MACHINE.

APPLICATION FILED AUG.30. 1919.

Patented Aug. 8, 1922.

IIIIIYi'I/Il/ WITNEESEfi 6% M M oniran PATENT GEORGE A. snrn, or ILION,NEW YORK, ASSIGNOR T0 REMINGTON TYPEWRI COMPANY, on ILION, NEW YORK, ACORPORATION on NEW YORK.

TYPEWRITING- MACHINE.

Specification of Tietters Patent.

Patented Aug. 8, 1922.

Application filed August 30, 1919. Serial No. 320,938.

its main object to provide a device for preventing the said spring frombecoming disrupted or completely unwound due to the breaking oraccidental release of the carriage strap or band.

To the above and other ends which will hereinafter appear, my inventionconsists in the features of construction,combinations of devices, andarrangements of parts hereinafter described and particularly pointed outin the claims.

In carrying out the invention in the present instance, I provide whatmay be termed a swinging stop or inertia pawl which is normallycontrolled by a light spring so that in ordinary stepby-step movementsor runs of the carriage said pawl will be held inoperative. Sometimesthe main spring becomes accidentally disconnected from the carriage,either through the breakage of the usual strap or because said strapescapes from the control Ofthe operator or repairman when the strapdisconnection or re-connection operation is taking place, or for someother reason. In such case the main spring drum attains a speed muchgreater than its speed under ordinary operations. the result being thatthe inertia pawl will fly outward, overcomingthe resistance of its lightspring,this outwardmovement being limited by a stop on the spring drum.When the pawl reaches this limit of outward movement its path isobstructed by a stationary stop which will arrest it and the spring drumautomatically,

and will hold the parts in arrested position until the operator orrepairman again assumes control, when a slight'pull on the spring drumstrap towards the right will release or separate the pawl or movablestop from the stationary stop and allow it to be restored by the lightspring to normal inoperative position.

My invention will be described and explained in detail in connectionwith the accompanying drawings wherein Figure 1 is a fragmentary frontelevation of the spring drum of a No. 10 Remington typewriting machineand its associate parts, with my invention applied thereto.

Figure 2 is a view corresponding to F igure 1 but showing the inertiapawl in operative positlon.

Figure 3 is a sectional detail view, the section being taken on a planeindicated by the dotted line at a" in Figure 1 and looking in thedirection of the arrow at said line.

Indicated at 1 in Fig. 1 is the rear bar of a No. 10 Remington carriage,to the righthand end of which is screwed arearwardly curved anddownwardly extending arm 2 terminating in a hook 8 which is engaged bythe outer end ofthe usual band or strap 4:, said strapbeing connected toa spring drum or wheel 5 mounted on a shaft 6 supported in a bracket 7secured to the top plate 8. The wheel or rotary element 5 is cut out,providing arms or spoke portions 9, and houses a coiled main or carriagespring 10, one end of which is secured to the wheel and the other end tothe shaft or axle of the wheel. Where the spring is connected to thewheel it is formed into a loop 10 that is slipped over a post or stud 10secured to the wheel arm 9, and there is a cover plate 10 for the springthat is secured to said post and also to another one diametricallyopposite; all as common in the Remington machine. This propelling springtends constantly through its action on the band or strap 4 to draw thecarriage leftward over the top plate, leftward movements of the carriagebeing controlled by escapement mechanism and tabulating mechanism of theusual or any suitable character.

When for any purpose it is desired to disconnect the carriage from thespring drum the strap or flexible connection a is disconnected from thehook 3 and preferably anchored to a stationary part. Sometimes, however,the strap slips from the fingers or it occasionally may break, theresult being that control of the spring drum is lost so that it runsdown very rapidly, sometimes resulting in a breakage of the parts, andin any event a loss of tension in the main spring 10. Besides the tapeor band is liable to become tangled up in the mechanism. The principalobject of my present invention is to avoid this breakage, entanglementand running down of the spring, and I accomplish this object byproviding an automatically acting stop mechanism comprising preferably.a'linovable stop or pawl on the spring drum and a relatively stationarystop,

which automatically coact to arrest the drunibefore it can turn very farafter control of it has been lost. The movable stop aforesaid,

which may be termed an inertia pawl or centrifugally-operating stop, .isdesignated in the drawings by the numeral 11, being pivotedtothe'forward face of one of the arms 9 by means of a shouldered pin orrivet 12 and out of the plane of the rim of the wheel. The pawl isadapted to turn freely on the pin whichis tightly riveted to said arm 9.A; light coiled spring 13 is connected to thepawl at one end, the otherend of said spring being anchored to-a lug 14 struck up from theadjacent arm-9. 'Normally the pull of the spring 13 is substantially ina line between its anchorage'M and the center of rotation of the pawl11, so that the pawl s thereby maintained in a substantially uniformnormal position without being in contact with any stopf As av resultofthe construction a rapid rotation of the spring drum, such as itwould'besubjected to under the abnormal conditions noted, would tend tothrow the free end of the stop or pawl outward. The outward swing of thepawl .under such conditions iswlimited preferably by a stop pin 15.Whenthe pawl is in contact with the stop pin its free' end projects[beyond the periphery of the spring drum and into the path of arelatively stationary stop in the form of .a pin 16 projecting forwardfrom the face of the bracket 7. i

From what has been said it is not though necessary to explain theoperation of the mechanism at length. The normal position of :the partsis shown in Fig. 1 and it is ap parent that at the ordinary speed ofrotation of the spring drum the stop pawl will not be substantiallyaii'ected but'will remain 1'11 or -;close to its normal position, sothat during such rotations the stop ipEtWl will pass the .stop pin 16without touching it. With the spring drum in the position shown in Fig.1,

however, if it he suddenly released by vdisconnecting the strap 4 fromthe carriage andfreeing the strap, said spring drum will stant 'to turnrap-idly, causing the pawl to fly outward against the :pull of thespring13 until arrested by the stop 15, bringingthe ing the drum and connectedparts.

free end of the .pawl beyond the periphery of the drum and so that itwill contact with the stop 16 -asyshown in Fig. 2, thus arrest- It isplain thata slight rightward pull applied .to

the band Lwhen the parts arein the Fig. 2 position will retract the drumandtmove the pawl or swinging stop far enough downward to permit its,point to escape from engagementnwith the stationary stop 16. Thereuponthespr ng lfi Will aotto restore the swinging stop pawl 11 to'its normalposition within the periphery of. the spring drum. The lug ld willprevent excess inward movement of the stop pawl.

The said spring wheel as customary carries a cup-like structurecomprising a bevel gear l'f and also a ratchet wheel18, which structureis secured to the wheel shaft by a scre'w 19.: These devices relate moreparticcentri'fugallyoperating stop to cause the ar rest of said rotatoryelement and -prevent;a0

undue unwinding of said spring when said rotatory element isdisconnected from-said carriage.

.2. The combination ofa drum, a driving sprlng therefor, acentrifugally-operatlng stop-pawl mounted thereon and, normally lyingwithin the periphery of said drum but when actuated adapted to project.beyond said periphery, astopon said drum for limiting the outward throwof said-'stop-pawl, and an exterior-1y arranged stationary stop toengage the projecting portion .of' said pawl when thrown out bycentrifugal force.

3. In atypewriting machine, the com-bina- I tion of a. spring" drum, astop ipivotally mounted on said drum, a second stopon said drum, arelatively stationary stop,land a spring normally maintaining saidpivoted stop out of position for .co-operation with said stationarystop, said pivoted stop .automatically throwing to operative positionagainst said second stop during abnormally rapid movements of said drum.I

1-. In-a-typewriting machine, the combination of a spring .drum, a stopmovably mounted on said drum, a second stop .on said drum, a relativelystationary stop, and spring means normally maintainingsaid movable-stopout of position for co-operation with said stationary stop, zsagidBlOV'? able stop being automatically thrown into operative position incontact withsaid second stop andagainst the pull, of said spring means-under abnormally rapid rotation of said spring drum. n

5. Ina typewriting machine, the combination with a spring drum,astoppawl piv-' oted thereon, a coiled spring connected to said pawl stopand maintaining it in 'agnorll O 5 mal position, a stop on, said springdrum for .1

limiting movement of said stop pawl in opposition to said spring, and arelatively stationary stop with which said stop pawl is adapted toco-operate.

6. In a typewriting machine, the combination of a carriage spring drum,a swinging stop mounted thereon, a second stop on said spring drum and arelatively stationary stop, the swinging stop co-operating with bothsaid other stops to lock said spring drum against rotation under theoperation of the main spring when said spring drum is disconnected fromsaid carriage and allowed freely to rotate.

Signed at llion, in the county of Herkirner and State of New York this20th day of August A. D. 1919.

GEORGE A. SEIB.

Witnesses:

LINNIE F. BURNETT, MARGARET M. PIERCE.

